Robert -



UNITED STATES FUR-Nas, er INDIANAPoLxsfrnDIAAf i y 'f y SPEQKIATIVONI forming bmbf Lette'rsgrateat'ive 511457,57@date-seamless; 1894i" `Y f vhplinemanfneaomre16,1393. sepsinolsssfzze (maniero Y f 'Be itlknownthat I, ROBERT' W. FURNAS, of

'Indianapolsoo'nntyoi'liiarion,V and ,State of.y

Indiana, have invented certain new and usefull Improvements 'in Street -Oleaning Ma-f '-1:cleaning-machine,whose Objectis to remove Sttmee'd descriptive theI dustj as Well asi-V the 4dirt]"f1- ernl thel street surface wi'thoutraisingthe du stin thel street, v

and v`itsnatfnrevrv'kill appear from 'the following frointhe gzitii'ering hoodirito a/'cen'trifugaidust 'f rreste'rgbutI in'returning the most of the v g Anther feature vof' 'rnyf invention *cons-ists in 'eor'nbining the above-features 'with' a oonstructionwh'ereby the air,i's, exhausted from thefhoodthrough',theupper ypart of the Vdirt dbox-,fthe latterbeing between ythe fhood land, the'fan.-

- A leading' featiire'iof my vinvention consistsyiira doubleihood, thatlisLone hood tiniensas large. fllhis isy-agdesirable .form .of 110011, there machine to the hood. The air' 'returned enf,A

ters the outer hood and this feeds the inner hoodv withai11. {Rhea-,ir enters one end ofthe innerv hood '.wihhs open preferably; and also creeps inonder 'the i` sidesyand is exhausted I from the other epd of suclrinner'hood. .f'l`h'e ters the small hood as heretofore, there air returned is ofcourse slightly. idust laden v and 'is kept circulating through the.v machine to enable the dust eventually to be collected in the dirt box. lVhere the return pipeenback pressure of the current in thefen. My

lpresent arrangement avoids this difficulty.

The pipe running to the dust arrester takes off the surplus dust laden air and passes the piritied air out of the machine. This surplus of course isequivalent to the amountof air that is drawn in under-the hood from the outside. Without this means of disposing of the surplus air, the vhood would have a smallthe currentgisretu'rned fromgthe:

amoiin t oi? d ust laden air escaping fro'rnit at times,

p'` Figurel is a side elevationpt my.machine yomitting theV power, mechanism and( the .rear

4ofvthedirtvwagon bed.fbeing partly broken awa-yf. Figisa frontelevationoffthe sarne, omitting the-,dust arrester and showing the -tri'ck and` hoodr in^ section.' Fig. 3 isa-plan.;4 viewotthehood. ,'Eig. 4 is .an enlargedseo. tional View of the same on the1ine, Fig. 3;,

In detail yl, isa-dirt wagon and 2a truok'or y platform supported on the end of a traction engine or other means ofvturn'ishing power to operate the fan mounted on su'chtruclL:

liis a hood extended transversely, across the, pathof-the machine 'and `having apipe .51ers`v tending from one end of itto an air tight dirt,l

box, 6,1 entering the; latterrnear lits top.; ,-1

l v' is a pipe leading from the dirt box'inea'nl itstop to'l the fan 3. 8 is a return-pipelead'- ingfrornthel fan ltothe hood.

- 9 is a s lnallpipe branching oi frein the.

pipe' 8 and leadingv tothe centriiugaldust arrester 10 mounted over adustboxll.. The; air tight' dirt box, G and the dust box .1,1' yI t iornrbyl separating the bed 'ofthe wagon into two Vchambersbythe partition 12', which is preferably hinged at. its upper en'd to the-top of .the lwagon bed. 'The lower endisffreelnu 1 order ltha'tit' may be liftedfup outlo thelway in *removin'g the 'contents of.the box 6-.5' The?A 1t will'beobseived that :the dirt-laden-air as 'Wagon isprovided Wit-h-anend gate lt'rhere'v) ,byz the contents. of the bedmay beremoved."y

z` iteo'r'nes from the'hood en'terslthe topofv the fl' box 6,- drzops'its. heavy..dirt into' the .b ox,"thef 7 tothe'fan. andy fromit the nrostof the-our-y rent. is vpropelled tothe hood; a srnall port-ion being propelled to the dust arrester.

The hood consists ot an inner hood 14 and vdust laden air then passes through rthe' pipe an outer hood 15, the 4latter entirely inclosing j the other end by the pipe 5. ih'e outer hood YOO lto

a gatheringv hood, a dirt box,

15 has the depending aprons 20 and is constructed in identically the same manner as thesmall'o'ne except that it is about twice as hgh,.twice as wide, and somewhat longer.

he return pipe 8 enters this outer hood.

The hood'is supported on cross bars 17 thatA l. In a pneumaticlstreet cleaning machine,l

a gathering hood, a dust arrester, an exhaust fan, means of conveying the air fron the hood to the exhaust fan and means of conveying a portion of the currentfrom the exhaust fan to the dust arrester and a portion tothe hood, substantially as shown and described.

2. In a pneumatic street cleaning machine, a centrifugal dust arrester, and means of exhausting the air from the hoed through the d irt box and propelling a small portion of it to the dust arrester and the balance to the hood, substan tiallyas shown and described.

,3. In a pneumatic street cleaning machine,

, a gathering hood,a dirt box,a pipe extending from the hood to the 'a pipe extending centrifugal dust veying a portion dirt box, an exhaust fan, from the box to the fan, a arrester, and means of conof the current to the dust Aarresterand a. por ion of vit to the hood, sub

' stantially as shown and describean air tight dirt box,

4. Ina pneumatic street cleaning machine, a` gathering hood, a pipe leading from the hood to the dirt box, an exhaust fama pipe leading from the 'dirt box to the fan, a dust box, a centrifugal dust arrester mounted on thedust box,a,dvided.pipe leading from the exhaust fan, a small branch of it extending to the dust arrester and a larger lbranch of it leading to the hood,substantially as shown and described.

5. In af pneumatic street cleaning machine, adoublehood consistingof two separate hoods,

.one inclosed Within` vdirt box mounted on such Aot it leading to the dust arrester `me within the other, substantially as shown and described.

6. In a pneumatic street cleaning machine,

a double hood consistingof two separate hoods,

exhausting the air returning it to the outer hood, substantially .as shown and described.

'7.l `In a pneumatic street cleaning machine, adouble hood eonsistingof two separate hoods, one inclosed withinthe other, oneend of the inner hood being open and leading from the other ,end of the same, a rc- .turn pi pe adapted 'to convey afportion of the into the outer hood, anda means currentof air of exhausting theair from .such vinner hood the other, and means ofl from the innerv hood and an exhaust pipe t and returning a portion thereof tothe outer i hood substantially as shown and described.

a double hood extended transversely across the path ot` the machine, and parallel with and close .to thev street surface, and consisting of two separate hoods, one inclosel withinmthe other, and niealns of exhausting the air `from` the inner hood and returning it to tlieouter hood, substantially as shown and described.

9. A pneumatic street consisting of a suitable carriage, an air tight carriage, a double hood supported from such carriage and contacting with the street surface and consisting of two separate hoods, one inclosed within the other, an exhaust pipe extending from one end ofthe inner hood tothe air tightdirt box, a fan mounted on the carriage, means of actuating such fan, a pipe leading from the air n a pneumatic street cleaning machine,

. l cleaning machine tight dirt box'to the' fan,adust box mounted on the carriage, a centrifugal dust arrester mounted onthe dust box, and a divided pipe leading from the exhaust fan, a smallwbranch and a larger branch to the hood, substantially as shown and described.

In witness whereof l have hereunto set my hand this 13th day ofOctober, 1893.

ROBERT lV. FURNAS. Witnesses:

V. H. Looxwoon, N. D. TILFORD. 

